Block Diagram

An Electronic lock is a locking device which operates by means of electric current. We can use Electronic lock for activating/deactivating Electric Lock. Electric locks use magnets, solenoids, or motors to actuate the lock by either supplying or removing power. More often electric locks are connected to an access control system. We can also use it to lock Electronic Devices by directly turning ON/OFF the power of the device. The main advantage of electronic lock over the Hardware lock is the ability to change the password without any change in the hardware.

Our device consists of the following section

1.       Microcontroller.

2.       Keypad.

3.       LCD.

4.       Memory.

5.       Relay.

6.       Power Supply

It is the heart of the unit. We have used ATMEL’s AT89S5I microcontroller. It performs all the functions like comparing the entered Password with the saved password, activating/deactivating the Relay, Displaying on LCD, Getting the password from the user, etc.

The keypad section consists of 12 keys i.e. 0-9, One Lock key & One Unlock Key. All these switches are directly connected to the Microcontroller. All these keys are TACTILE SWITCHES; they are used to enter the code, change the code & LOCK/UNLOCK the device.

A Two line, 16 characters LCD is used to display the status of the system i.e. LOCKED/UNLOCKED as well as to display the entered code.

An EEPROM is used to store the password. So even if there is power failure the password is saved in EEPROM.

The controller cannot directly activate/ deactivate the Electric Lock. So relay is used to activate/ deactivate the lock.

The complete circuit works on 5volts. In this section this 5 volts is generated from 230v. Click here for Power Supply Details.

---

Add this page to your favorite Social Bookmarking websites

Users' Comments (0)

Add your comment